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Chemistry
Tests for Anions
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Cards (17)
What are anions?
Negatively
charged
ions
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What tests are covered for anions in the video?
Test for
carbonate ions
Test for
sulfate ions
Test for
halide ions
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What happens when a carbonate reacts with an acid?
It forms a salt,
carbon dioxide
, and water
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How can you test for carbonates in a solution?
Add dilute
hydrochloric acid
and
lime water
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What indicates a positive test for carbonates?
Lime water
turns cloudy
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What is the first step in the sulfate test?
Add dilute
hydrochloric acid
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Why do we add dilute hydrochloric acid in the sulfate test?
To remove
carbonate
or
sulfite
impurities
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What forms when barium ions react with sulfate ions?
Barium sulfate
, a white
precipitate
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What is the key result of the sulfate test?
Formation of a
white precipitate
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What is the first step in the halide test?
Add
dilute nitric acid
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What is added in the second step of the halide test?
Add
silver nitrate
solution
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What do silver ions react with in the halide test?
Halide ions to form
precipitates
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What color precipitate forms with chloride ions?
White precipitate (
silver chloride
)
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What color precipitate forms with bromide ions?
Cream precipitate (
silver bromide
)
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What color precipitate forms with iodide ions?
Yellow precipitate (
silver iodide
)
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What is the process for testing halide ions?
Add dilute
nitric acid
to remove impurities
Add
silver nitrate
solution
Observe precipitate color:
White for
chloride
Cream for
bromide
Yellow for
iodide
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